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/*
* Copyright 2013 Canonical Ltd.
*
* This file is part of ubuntu-rssreader-app.
*
* ubuntu-rssreader-app is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 3.
*
* ubuntu-rssreader-app is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
.pragma library
var MILLIS_IN_SECOND = 1000
var SECONDS_LIMIT = 60 * MILLIS_IN_SECOND; // used as reference
var MINUTES_LIMIT = 60 * SECONDS_LIMIT; // print minutes up to 1h
var HOURS_LIMIT = 12 * MINUTES_LIMIT; // print hours up to 12h
var DAY_LIMIT = 24 * MINUTES_LIMIT; // print '<val> days ago' up to 30 days back
var DAYS_LIMIT = 30 * DAY_LIMIT; // print '<val> days ago' up to 30 days back
// Convert date string to a number of seconds since 1970-01-01
function parseDate(dateAsStr) {
return new Date(dateAsStr).getTime()/MILLIS_IN_SECOND;
}
// date is a number of seconds since 1970-01-01
function formatRelativeTime(i18n, date) {
// fallback if none of the other formatters matched
function defaultFallbackFormat(then) {
// TRANSLATORS: this is a time formatting string,
// see http://qt-project.org/doc/qt-5.0/qtqml/qml-qtquick2-date.html#details for valid expressions
return Qt.formatDateTime(then, i18n.tr("MMMM d"))
}
// Simple matches all diffs < limit, formats using the format function.
function SimpleFormatter(limit, format) {
this.matches = function (now, then, diff) { return diff < limit }
this.format = format
}
// Matches yesterday date
function YesterdayFormatter() {
this.matches = function (now, then, diff) {
return diff < DAY_LIMIT && now.getDate() !== then.getDate();
}
this.format = function (now, then, diff) {
return i18n.tr("Yesterday at %1").arg(
/* TRANSLATORS: this is a time formatting string,
see http://qt-project.org/doc/qt-5.0/qtqml/qml-qtquick2-date.html#details for valid expressions */
Qt.formatDateTime(then, i18n.tr("h:mm AP")))
}
}
// Matches up to 7 days ago (formats date as a weekday + time)
function WeekFormatter() {
this.matches = function (now, then, diff) {
return diff < 7 * DAY_LIMIT
}
this.format = function (now, then, diff) {
// TRANSLATORS: this is a time formatting string,
// see http://qt-project.org/doc/qt-5.0/qtqml/qml-qtquick2-date.html#details for valid expressions
return Qt.formatDateTime(then, i18n.tr("ddd, h:mm AP"));
}
}
// An array of formatting object processed from 0 up to a matching object.
// If none of the object matches a default fallback formatter will be used.
var FORMATTERS = [
new SimpleFormatter(SECONDS_LIMIT, function (now, then, diff) { return i18n.tr("A few seconds ago...") }),
new SimpleFormatter(MINUTES_LIMIT, function (now, then, diff) {
var val = Math.floor(diff / SECONDS_LIMIT)
return i18n.tr("%1 minute ago", "%1 minutes ago", val).arg(val)
}),
new SimpleFormatter(HOURS_LIMIT, function (now, then, diff) {
var val = Math.floor(diff / MINUTES_LIMIT)
return i18n.tr("%1 hour ago", "%1 hours ago", val).arg(val)
}),
new YesterdayFormatter(),
new WeekFormatter(),
new SimpleFormatter(DAYS_LIMIT, function (now, then, diff) {
var val = Math.floor(diff / DAY_LIMIT)
return i18n.tr("%1 day ago", "%1 days ago", val).arg(val)
})
]
function formatDiff(now, then, diff) {
for (var i=0; i<FORMATTERS.length; ++i) {
var formatter = FORMATTERS[i]
if (formatter.matches(now, then, diff)) {
return formatter.format(now, then, diff)
}
}
return defaultFallbackFormat(then)
}
var now = new Date();
var then = new Date(date*MILLIS_IN_SECOND);
var diff = now - then;
var formattedDiff = formatDiff(now, then, diff);
return formattedDiff;
}
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